<!DOCTYPE html>
<html lang="en-US">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <title>面试官：如何提高webpack的构建速度？ | 前端档案</title>
    <meta name="generator" content="VuePress 1.8.2">
    <link rel="icon" href="/favicon.ico">
    <meta name="description" content="前端通关宝典">
    <meta name="theme-color" content="#3eaf7c">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-status-bar-style" content="black">
    
    <link rel="preload" href="/assets/css/0.styles.e02fc531.css" as="style"><link rel="preload" href="/assets/js/app.bf44e39b.js" as="script"><link rel="preload" href="/assets/js/2.db7a59af.js" as="script"><link rel="preload" href="/assets/js/249.35bae652.js" as="script"><link rel="prefetch" href="/assets/js/10.3bbe2f24.js"><link rel="prefetch" href="/assets/js/100.43061c81.js"><link rel="prefetch" href="/assets/js/101.2e8a188c.js"><link rel="prefetch" href="/assets/js/102.3f4f14f0.js"><link rel="prefetch" href="/assets/js/103.5ed45f48.js"><link rel="prefetch" href="/assets/js/104.29ef9283.js"><link rel="prefetch" href="/assets/js/105.e4051d70.js"><link rel="prefetch" href="/assets/js/106.ec073f00.js"><link rel="prefetch" href="/assets/js/107.9b165150.js"><link rel="prefetch" href="/assets/js/108.c0031864.js"><link rel="prefetch" href="/assets/js/109.06bb75a7.js"><link rel="prefetch" href="/assets/js/11.402e3434.js"><link rel="prefetch" href="/assets/js/110.edc92528.js"><link rel="prefetch" href="/assets/js/111.e50e0cca.js"><link rel="prefetch" href="/assets/js/112.b0decdf4.js"><link rel="prefetch" href="/assets/js/113.f0801886.js"><link rel="prefetch" href="/assets/js/114.25ab8fa4.js"><link rel="prefetch" href="/assets/js/115.36fc62f3.js"><link rel="prefetch" href="/assets/js/116.8df9a6aa.js"><link rel="prefetch" href="/assets/js/117.1ec0fada.js"><link rel="prefetch" href="/assets/js/118.51c54869.js"><link rel="prefetch" href="/assets/js/119.d708669d.js"><link rel="prefetch" href="/assets/js/12.eba9a66a.js"><link rel="prefetch" href="/assets/js/120.a44efeea.js"><link rel="prefetch" href="/assets/js/121.581a4ae4.js"><link rel="prefetch" href="/assets/js/122.e54e19e1.js"><link rel="prefetch" href="/assets/js/123.62aa41d0.js"><link rel="prefetch" href="/assets/js/124.c51c6b7f.js"><link rel="prefetch" href="/assets/js/125.68055811.js"><link rel="prefetch" href="/assets/js/126.8b16d246.js"><link rel="prefetch" href="/assets/js/127.fc7608d6.js"><link rel="prefetch" href="/assets/js/128.0df431fc.js"><link rel="prefetch" href="/assets/js/129.77241cfd.js"><link rel="prefetch" href="/assets/js/13.a3e65817.js"><link rel="prefetch" href="/assets/js/130.2bf0b622.js"><link rel="prefetch" href="/assets/js/131.77da1093.js"><link rel="prefetch" href="/assets/js/132.c1ac84bc.js"><link rel="prefetch" href="/assets/js/133.001af559.js"><link rel="prefetch" href="/assets/js/134.98ff69db.js"><link rel="prefetch" href="/assets/js/135.b91963f4.js"><link rel="prefetch" href="/assets/js/136.e3df531a.js"><link rel="prefetch" href="/assets/js/137.157c5a5f.js"><link rel="prefetch" href="/assets/js/138.1d3a1791.js"><link rel="prefetch" href="/assets/js/139.9e17df54.js"><link rel="prefetch" href="/assets/js/14.bd9cc5f8.js"><link rel="prefetch" href="/assets/js/140.22839840.js"><link rel="prefetch" href="/assets/js/141.dbde614d.js"><link rel="prefetch" href="/assets/js/142.5a6858ba.js"><link rel="prefetch" href="/assets/js/143.e26d707c.js"><link rel="prefetch" href="/assets/js/144.5b1fbe13.js"><link rel="prefetch" href="/assets/js/145.09921e20.js"><link rel="prefetch" href="/assets/js/146.8ea606b7.js"><link rel="prefetch" href="/assets/js/147.41bda9d5.js"><link rel="prefetch" href="/assets/js/148.d89f18bc.js"><link rel="prefetch" href="/assets/js/149.16aa39c9.js"><link rel="prefetch" href="/assets/js/15.deb2f25a.js"><link rel="prefetch" href="/assets/js/150.07798494.js"><link rel="prefetch" href="/assets/js/151.6732ee94.js"><link rel="prefetch" href="/assets/js/152.c644167e.js"><link rel="prefetch" href="/assets/js/153.040f256b.js"><link rel="prefetch" href="/assets/js/154.1cec3035.js"><link rel="prefetch" href="/assets/js/155.a4b51a17.js"><link rel="prefetch" href="/assets/js/156.095b78e0.js"><link rel="prefetch" href="/assets/js/157.eb262a26.js"><link rel="prefetch" href="/assets/js/158.35756e8c.js"><link rel="prefetch" href="/assets/js/159.6ac43664.js"><link rel="prefetch" href="/assets/js/16.c7b17381.js"><link rel="prefetch" href="/assets/js/160.0a56c40c.js"><link rel="prefetch" href="/assets/js/161.8320b48a.js"><link rel="prefetch" href="/assets/js/162.09ba1172.js"><link rel="prefetch" href="/assets/js/163.f7fb82e8.js"><link rel="prefetch" href="/assets/js/164.ab9df42b.js"><link rel="prefetch" href="/assets/js/165.f012858f.js"><link rel="prefetch" href="/assets/js/166.b3f190e3.js"><link rel="prefetch" href="/assets/js/167.43b66e59.js"><link rel="prefetch" href="/assets/js/168.4eb162d3.js"><link rel="prefetch" href="/assets/js/169.0375d2cf.js"><link rel="prefetch" href="/assets/js/17.da61c942.js"><link rel="prefetch" href="/assets/js/170.90c9c235.js"><link rel="prefetch" href="/assets/js/171.672fc257.js"><link rel="prefetch" href="/assets/js/172.dfa9d8d9.js"><link rel="prefetch" href="/assets/js/173.61a6ec8e.js"><link rel="prefetch" href="/assets/js/174.4f4ef0d7.js"><link rel="prefetch" href="/assets/js/175.675d01d1.js"><link rel="prefetch" href="/assets/js/176.5bd1bcb7.js"><link rel="prefetch" href="/assets/js/177.4355dadd.js"><link rel="prefetch" href="/assets/js/178.79ed29b8.js"><link rel="prefetch" href="/assets/js/179.2247dc30.js"><link rel="prefetch" href="/assets/js/18.6e554767.js"><link rel="prefetch" href="/assets/js/180.db79361a.js"><link rel="prefetch" href="/assets/js/181.85a33295.js"><link rel="prefetch" href="/assets/js/182.0bc317bc.js"><link rel="prefetch" href="/assets/js/183.7769a38e.js"><link rel="prefetch" href="/assets/js/184.9b0aba05.js"><link rel="prefetch" href="/assets/js/185.f6dc87bd.js"><link rel="prefetch" href="/assets/js/186.e3b7de00.js"><link rel="prefetch" href="/assets/js/187.a6dadcea.js"><link rel="prefetch" href="/assets/js/188.d3f8b0e3.js"><link rel="prefetch" href="/assets/js/189.1112499f.js"><link rel="prefetch" href="/assets/js/19.f800e0d1.js"><link rel="prefetch" href="/assets/js/190.e3255e84.js"><link rel="prefetch" href="/assets/js/191.34deece6.js"><link rel="prefetch" href="/assets/js/192.69821c0e.js"><link rel="prefetch" href="/assets/js/193.769a5088.js"><link rel="prefetch" href="/assets/js/194.afaa2cde.js"><link rel="prefetch" href="/assets/js/195.5b94bbc6.js"><link rel="prefetch" href="/assets/js/196.3b078264.js"><link rel="prefetch" href="/assets/js/197.2d9585d3.js"><link rel="prefetch" href="/assets/js/198.3095d8b8.js"><link rel="prefetch" href="/assets/js/199.79b6db11.js"><link rel="prefetch" href="/assets/js/20.4a74a968.js"><link rel="prefetch" href="/assets/js/200.c309ef7a.js"><link rel="prefetch" href="/assets/js/201.bded46e8.js"><link rel="prefetch" href="/assets/js/202.801fb3ea.js"><link rel="prefetch" href="/assets/js/203.b9933f5e.js"><link rel="prefetch" href="/assets/js/204.255b43df.js"><link rel="prefetch" href="/assets/js/205.000fb7ac.js"><link rel="prefetch" href="/assets/js/206.8f945829.js"><link rel="prefetch" href="/assets/js/207.74942b2e.js"><link rel="prefetch" href="/assets/js/208.329d8230.js"><link rel="prefetch" href="/assets/js/209.3fc54586.js"><link rel="prefetch" href="/assets/js/21.5f725cbd.js"><link rel="prefetch" href="/assets/js/210.1aa9659f.js"><link rel="prefetch" href="/assets/js/211.702df03f.js"><link rel="prefetch" href="/assets/js/212.ca95f208.js"><link rel="prefetch" href="/assets/js/213.024b4fa6.js"><link rel="prefetch" href="/assets/js/214.e2830dd8.js"><link rel="prefetch" href="/assets/js/215.0b646cb4.js"><link rel="prefetch" href="/assets/js/216.9bd6d019.js"><link rel="prefetch" href="/assets/js/217.586593b4.js"><link rel="prefetch" href="/assets/js/218.a2244829.js"><link rel="prefetch" href="/assets/js/219.1d858220.js"><link rel="prefetch" href="/assets/js/22.7d2b7a74.js"><link rel="prefetch" href="/assets/js/220.7f5e3dbd.js"><link rel="prefetch" href="/assets/js/221.d1f79d31.js"><link rel="prefetch" href="/assets/js/222.51d8a12c.js"><link rel="prefetch" href="/assets/js/223.797028ea.js"><link rel="prefetch" href="/assets/js/224.d925bf8b.js"><link rel="prefetch" href="/assets/js/225.cfe12606.js"><link rel="prefetch" href="/assets/js/226.b6bd41b4.js"><link rel="prefetch" href="/assets/js/227.15412d16.js"><link rel="prefetch" href="/assets/js/228.66af5157.js"><link rel="prefetch" href="/assets/js/229.cfb11559.js"><link rel="prefetch" href="/assets/js/23.1409c9f4.js"><link rel="prefetch" href="/assets/js/230.d2e613b5.js"><link rel="prefetch" href="/assets/js/231.85b8958b.js"><link rel="prefetch" href="/assets/js/232.42df48c8.js"><link rel="prefetch" href="/assets/js/233.d3be0c78.js"><link rel="prefetch" href="/assets/js/234.bb68d0be.js"><link rel="prefetch" href="/assets/js/235.bfd00052.js"><link rel="prefetch" href="/assets/js/236.3d58cc9d.js"><link rel="prefetch" href="/assets/js/237.d9af6062.js"><link rel="prefetch" href="/assets/js/238.54894974.js"><link rel="prefetch" href="/assets/js/239.b69669d0.js"><link rel="prefetch" href="/assets/js/24.e06b2b32.js"><link rel="prefetch" href="/assets/js/240.44f7b333.js"><link rel="prefetch" href="/assets/js/241.2d307b1a.js"><link rel="prefetch" href="/assets/js/242.47aecf42.js"><link rel="prefetch" href="/assets/js/243.b5afbb6e.js"><link rel="prefetch" href="/assets/js/244.8e04094f.js"><link rel="prefetch" href="/assets/js/245.78009475.js"><link rel="prefetch" href="/assets/js/246.eb7991c2.js"><link rel="prefetch" href="/assets/js/247.00c024fd.js"><link rel="prefetch" href="/assets/js/248.144c2842.js"><link rel="prefetch" href="/assets/js/25.5e7aeaa8.js"><link rel="prefetch" href="/assets/js/250.854bde18.js"><link rel="prefetch" href="/assets/js/251.7cbb77f8.js"><link rel="prefetch" href="/assets/js/252.1ed96448.js"><link rel="prefetch" href="/assets/js/253.9d736b7d.js"><link rel="prefetch" href="/assets/js/254.137c6595.js"><link rel="prefetch" href="/assets/js/255.ac6865dc.js"><link rel="prefetch" href="/assets/js/256.055e06fd.js"><link rel="prefetch" href="/assets/js/257.63559614.js"><link rel="prefetch" href="/assets/js/258.b6958ba1.js"><link rel="prefetch" href="/assets/js/259.bc6da491.js"><link rel="prefetch" href="/assets/js/26.77d42111.js"><link rel="prefetch" href="/assets/js/260.a8e9559d.js"><link rel="prefetch" href="/assets/js/261.b051c6dd.js"><link rel="prefetch" href="/assets/js/262.e83c7ca8.js"><link rel="prefetch" href="/assets/js/263.bd14a165.js"><link rel="prefetch" href="/assets/js/264.65c3b624.js"><link rel="prefetch" href="/assets/js/265.db4371b9.js"><link rel="prefetch" href="/assets/js/266.97118d6c.js"><link rel="prefetch" href="/assets/js/267.de83cb0b.js"><link rel="prefetch" href="/assets/js/268.2bdd86cb.js"><link rel="prefetch" href="/assets/js/269.9c9a802f.js"><link rel="prefetch" href="/assets/js/27.fa37605f.js"><link rel="prefetch" href="/assets/js/270.f599f9fe.js"><link rel="prefetch" href="/assets/js/271.275d4619.js"><link rel="prefetch" href="/assets/js/272.ed0fabf6.js"><link rel="prefetch" href="/assets/js/273.fc279fbe.js"><link rel="prefetch" href="/assets/js/274.fe4b3d21.js"><link rel="prefetch" href="/assets/js/275.922677e1.js"><link rel="prefetch" href="/assets/js/276.597ceb81.js"><link rel="prefetch" href="/assets/js/277.71871d2e.js"><link rel="prefetch" href="/assets/js/278.10923657.js"><link rel="prefetch" href="/assets/js/279.cddbf2d7.js"><link rel="prefetch" href="/assets/js/28.7418a003.js"><link rel="prefetch" href="/assets/js/280.66542c64.js"><link rel="prefetch" href="/assets/js/281.c7ca5292.js"><link rel="prefetch" href="/assets/js/282.d105ef08.js"><link rel="prefetch" href="/assets/js/283.ae8d69c7.js"><link rel="prefetch" href="/assets/js/284.8763c337.js"><link rel="prefetch" href="/assets/js/285.cce4e007.js"><link rel="prefetch" href="/assets/js/29.42b5bf54.js"><link rel="prefetch" href="/assets/js/3.a2af090e.js"><link rel="prefetch" href="/assets/js/30.7fe0ece5.js"><link rel="prefetch" href="/assets/js/31.e05d012e.js"><link rel="prefetch" href="/assets/js/32.0a6466c6.js"><link rel="prefetch" href="/assets/js/33.8db270b1.js"><link rel="prefetch" href="/assets/js/34.c6e6ae70.js"><link rel="prefetch" href="/assets/js/35.8fc12d56.js"><link rel="prefetch" href="/assets/js/36.cb54baf3.js"><link rel="prefetch" href="/assets/js/37.656cb8eb.js"><link rel="prefetch" href="/assets/js/38.9152ff6b.js"><link rel="prefetch" href="/assets/js/39.f71e5e3d.js"><link rel="prefetch" href="/assets/js/4.02de3c47.js"><link rel="prefetch" href="/assets/js/40.3d664ab4.js"><link rel="prefetch" href="/assets/js/41.fc6e4f78.js"><link rel="prefetch" href="/assets/js/42.c17c3353.js"><link rel="prefetch" href="/assets/js/43.e78a329f.js"><link rel="prefetch" href="/assets/js/44.326a0948.js"><link rel="prefetch" href="/assets/js/45.67e6e1d4.js"><link rel="prefetch" href="/assets/js/46.85f71b1e.js"><link rel="prefetch" href="/assets/js/47.f2e524a6.js"><link rel="prefetch" href="/assets/js/48.843108ee.js"><link rel="prefetch" href="/assets/js/49.98713c95.js"><link rel="prefetch" href="/assets/js/5.f38c3daa.js"><link rel="prefetch" href="/assets/js/50.2c70898f.js"><link rel="prefetch" href="/assets/js/51.023fea5d.js"><link rel="prefetch" href="/assets/js/52.3877af4c.js"><link rel="prefetch" href="/assets/js/53.3938d117.js"><link rel="prefetch" href="/assets/js/54.4cf45721.js"><link rel="prefetch" href="/assets/js/55.6894de94.js"><link rel="prefetch" href="/assets/js/56.48fd0f63.js"><link rel="prefetch" href="/assets/js/57.2c3b8155.js"><link rel="prefetch" href="/assets/js/58.fee976b4.js"><link rel="prefetch" href="/assets/js/59.d57c3ac9.js"><link rel="prefetch" href="/assets/js/6.a7d50f34.js"><link rel="prefetch" href="/assets/js/60.9954df49.js"><link rel="prefetch" href="/assets/js/61.1b870f60.js"><link rel="prefetch" href="/assets/js/62.37537ac3.js"><link rel="prefetch" href="/assets/js/63.5e7cfac8.js"><link rel="prefetch" href="/assets/js/64.407003ca.js"><link rel="prefetch" href="/assets/js/65.ba6c5d7d.js"><link rel="prefetch" href="/assets/js/66.2b5a751b.js"><link rel="prefetch" href="/assets/js/67.2faf15d0.js"><link rel="prefetch" href="/assets/js/68.19e50dcb.js"><link rel="prefetch" href="/assets/js/69.eec003cb.js"><link rel="prefetch" href="/assets/js/7.6c196c91.js"><link rel="prefetch" href="/assets/js/70.98d2461a.js"><link rel="prefetch" href="/assets/js/71.184225a4.js"><link rel="prefetch" href="/assets/js/72.956d136a.js"><link rel="prefetch" href="/assets/js/73.3e68378e.js"><link rel="prefetch" href="/assets/js/74.cec669e7.js"><link rel="prefetch" href="/assets/js/75.d418b5f0.js"><link rel="prefetch" href="/assets/js/76.f3f9ccd6.js"><link rel="prefetch" href="/assets/js/77.f24df03b.js"><link rel="prefetch" href="/assets/js/78.7eee67a8.js"><link rel="prefetch" href="/assets/js/79.8fadb3f7.js"><link rel="prefetch" href="/assets/js/8.b7eb2fb2.js"><link rel="prefetch" href="/assets/js/80.4f6165b0.js"><link rel="prefetch" href="/assets/js/81.49b03807.js"><link rel="prefetch" href="/assets/js/82.7ea07224.js"><link rel="prefetch" href="/assets/js/83.d6bd71b7.js"><link rel="prefetch" href="/assets/js/84.26db1aa8.js"><link rel="prefetch" href="/assets/js/85.c8f1f3bb.js"><link rel="prefetch" href="/assets/js/86.fd1c3c7f.js"><link rel="prefetch" href="/assets/js/87.38ab6ed9.js"><link rel="prefetch" href="/assets/js/88.f0a874e0.js"><link rel="prefetch" href="/assets/js/89.2b3352d4.js"><link rel="prefetch" href="/assets/js/9.d7ae4925.js"><link rel="prefetch" href="/assets/js/90.286cc7d4.js"><link rel="prefetch" href="/assets/js/91.c17c366b.js"><link rel="prefetch" href="/assets/js/92.29bc2389.js"><link rel="prefetch" href="/assets/js/93.6d335097.js"><link rel="prefetch" href="/assets/js/94.89ab26c7.js"><link rel="prefetch" href="/assets/js/95.f2493183.js"><link rel="prefetch" href="/assets/js/96.6662ec36.js"><link rel="prefetch" href="/assets/js/97.22c9d3f9.js"><link rel="prefetch" href="/assets/js/98.0b0b77a2.js"><link rel="prefetch" href="/assets/js/99.df5f5981.js">
    <link rel="stylesheet" href="/assets/css/0.styles.e02fc531.css">
  </head>
  <body>
    <div id="app" data-server-rendered="true"><div class="theme-container"><header class="navbar"><div class="sidebar-button"><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" role="img" viewBox="0 0 448 512" class="icon"><path fill="currentColor" d="M436 124H12c-6.627 0-12-5.373-12-12V80c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12z"></path></svg></div> <a href="/" class="home-link router-link-active"><img src="/images/logo.png" alt="前端档案" class="logo"> <span class="site-name can-hide">前端档案</span></a> <div class="links"><div class="search-box"><input aria-label="Search" autocomplete="off" spellcheck="false" value=""> <!----></div> <nav class="nav-links can-hide"><div class="nav-item"><a href="/guide/" class="nav-link">
  指南
</a></div><div class="nav-item"><a href="/fe/" class="nav-link router-link-active">
  前端
</a></div><div class="nav-item"><a href="/be/" class="nav-link">
  后端
</a></div><div class="nav-item"><a href="/base/" class="nav-link">
  基础
</a></div><div class="nav-item"><a href="/tools/" class="nav-link">
  工具
</a></div><div class="nav-item"><a href="/resume/" class="nav-link">
  简历
</a></div><div class="nav-item"><a href="/experience/" class="nav-link">
  面经
</a></div><div class="nav-item"><a href="/technology/" class="nav-link">
  八股文
</a></div><div class="nav-item"><a href="/thinks/" class="nav-link">
  思考
</a></div> <!----></nav></div></header> <div class="sidebar-mask"></div> <aside class="sidebar"><nav class="nav-links"><div class="nav-item"><a href="/guide/" class="nav-link">
  指南
</a></div><div class="nav-item"><a href="/fe/" class="nav-link router-link-active">
  前端
</a></div><div class="nav-item"><a href="/be/" class="nav-link">
  后端
</a></div><div class="nav-item"><a href="/base/" class="nav-link">
  基础
</a></div><div class="nav-item"><a href="/tools/" class="nav-link">
  工具
</a></div><div class="nav-item"><a href="/resume/" class="nav-link">
  简历
</a></div><div class="nav-item"><a href="/experience/" class="nav-link">
  面经
</a></div><div class="nav-item"><a href="/technology/" class="nav-link">
  八股文
</a></div><div class="nav-item"><a href="/thinks/" class="nav-link">
  思考
</a></div> <!----></nav>  <ul class="sidebar-links"><li><a href="/fe/" aria-current="page" class="sidebar-link">大前端学习路径 + B站资源整合</a></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>HTML</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>CSS</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>JavaScript</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>TypeScript</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ES6</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Vue</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Vue3</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>React</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>Webpack</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/fe/webpack/" aria-current="page" class="sidebar-link">对webpack的理解？解决了什么问题？</a></li><li><a href="/fe/webpack/build_process.html" class="sidebar-link">面试官：说说webpack的构建流程?</a></li><li><a href="/fe/webpack/Loader.html" class="sidebar-link">Loader</a></li><li><a href="/fe/webpack/Plugin.html" class="sidebar-link">Plugin</a></li><li><a href="/fe/webpack/Loader_Plugin.html" class="sidebar-link">Loader和Plugin的区别？编写Loader，Plugin的思路？</a></li><li><a href="/fe/webpack/HMR.html" class="sidebar-link">面试官：说说webpack的热更新是如何做到的？原理是什么？</a></li><li><a href="/fe/webpack/proxy.html" class="sidebar-link">面试官：说说webpack proxy工作原理？为什么能解决跨域?</a></li><li><a href="/fe/webpack/performance.html" class="sidebar-link">Webpack 性能优化</a></li><li><a href="/fe/webpack/improve_build.html" aria-current="page" class="active sidebar-link">面试官：如何提高webpack的构建速度？</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/fe/webpack/improve_build.html#一、背景" class="sidebar-link">一、背景</a></li><li class="sidebar-sub-header"><a href="/fe/webpack/improve_build.html#二、如何优化" class="sidebar-link">二、如何优化</a></li><li class="sidebar-sub-header"><a href="/fe/webpack/improve_build.html#参考文献" class="sidebar-link">参考文献</a></li></ul></li><li><a href="/fe/webpack/Rollup_Parcel_snowpack_Vite.html" class="sidebar-link">面试官：与webpack类似的工具还有哪些？区别？</a></li><li><a href="/fe/webpack/babel.html" class="sidebar-link">Babel</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Node.js</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>性能优化</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>手写代码</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="面试官-如何提高webpack的构建速度"><a href="#面试官-如何提高webpack的构建速度" class="header-anchor">#</a> 面试官：如何提高webpack的构建速度？</h1> <p><img src="https://static.vue-js.com/3a1b8620-b01b-11eb-85f6-6fac77c0c9b3.png" alt=""></p> <h2 id="一、背景"><a href="#一、背景" class="header-anchor">#</a> 一、背景</h2> <p>随着我们的项目涉及到页面越来越多，功能和业务代码也会随着越多，相应的 <code>webpack</code> 的构建时间也会越来越久</p> <p>构建时间与我们日常开发效率密切相关，当我们本地开发启动 <code>devServer</code> 或者 <code>build</code> 的时候，如果时间过长，会大大降低我们的工作效率</p> <p>所以，优化<code>webpack</code> 构建速度是十分重要的环节</p> <h2 id="二、如何优化"><a href="#二、如何优化" class="header-anchor">#</a> 二、如何优化</h2> <p>常见的提升构建速度的手段有如下：</p> <ul><li>优化 loader 配置</li> <li>合理使用 resolve.extensions</li> <li>优化 resolve.modules</li> <li>优化 resolve.alias</li> <li>使用 DLLPlugin 插件</li> <li>使用 cache-loader</li> <li>terser 启动多线程</li> <li>合理使用 sourceMap</li></ul> <h3 id="优化loader配置"><a href="#优化loader配置" class="header-anchor">#</a> 优化loader配置</h3> <p>在使用<code>loader</code>时，可以通过配置<code>include</code>、<code>exclude</code>、<code>test</code>属性来匹配文件，接触<code>include</code>、<code>exclude</code>规定哪些匹配应用<code>loader</code></p> <p>如采用 ES6 的项目为例，在配置 <code>babel-loader</code>时，可以这样：</p> <div class="language-js extra-class"><pre class="language-js"><code>module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
  module<span class="token operator">:</span> <span class="token punctuation">{</span>
    rules<span class="token operator">:</span> <span class="token punctuation">[</span>
      <span class="token punctuation">{</span>
        <span class="token comment">// 如果项目源码中只有 js 文件就不要写成 /\.jsx?$/，提升正则表达式性能</span>
        test<span class="token operator">:</span> <span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">\.js$</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">,</span>
        <span class="token comment">// babel-loader 支持缓存转换出的结果，通过 cacheDirectory 选项开启</span>
        use<span class="token operator">:</span> <span class="token punctuation">[</span><span class="token string">'babel-loader?cacheDirectory'</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
        <span class="token comment">// 只对项目根目录下的 src 目录中的文件采用 babel-loader</span>
        include<span class="token operator">:</span> path<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">'src'</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
      <span class="token punctuation">}</span><span class="token punctuation">,</span>
    <span class="token punctuation">]</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre></div><h3 id="合理使用-resolve-extensions"><a href="#合理使用-resolve-extensions" class="header-anchor">#</a> 合理使用 resolve.extensions</h3> <p>在开发中我们会有各种各样的模块依赖，这些模块可能来自于自己编写的代码，也可能来自第三方库， <code>resolve</code>可以帮助<code>webpack</code>从每个 <code>require/import</code> 语句中，找到需要引入到合适的模块代码</p> <p>通过<code>resolve.extensions</code>是解析到文件时自动添加拓展名，默认情况如下：</p> <div class="language-js extra-class"><pre class="language-js"><code>module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
    <span class="token operator">...</span>
    extensions<span class="token operator">:</span><span class="token punctuation">[</span><span class="token string">&quot;.warm&quot;</span><span class="token punctuation">,</span><span class="token string">&quot;.mjs&quot;</span><span class="token punctuation">,</span><span class="token string">&quot;.js&quot;</span><span class="token punctuation">,</span><span class="token string">&quot;.json&quot;</span><span class="token punctuation">]</span>
<span class="token punctuation">}</span>
</code></pre></div><p>当我们引入文件的时候，若没有文件后缀名，则会根据数组内的值依次查找</p> <p>当我们配置的时候，则不要随便把所有后缀都写在里面，这会调用多次文件的查找，这样就会减慢打包速度</p> <h3 id="优化-resolve-modules"><a href="#优化-resolve-modules" class="header-anchor">#</a> 优化 resolve.modules</h3> <p><code>resolve.modules</code> 用于配置 <code>webpack</code> 去哪些目录下寻找第三方模块。默认值为<code>['node_modules']</code>，所以默认会从<code>node_modules</code>中查找文件
当安装的第三方模块都放在项目根目录下的 <code>./node_modules</code>目录下时，所以可以指明存放第三方模块的绝对路径，以减少寻找，配置如下：</p> <div class="language- extra-class"><pre class="language-text"><code>module.exports = {
  resolve: {
    // 使用绝对路径指明第三方模块存放的位置，以减少搜索步骤
    // 其中 __dirname 表示当前工作目录，也就是项目根目录
    modules: [path.resolve(__dirname, 'node_modules')]
  },
};
</code></pre></div><h3 id="优化-resolve-alias"><a href="#优化-resolve-alias" class="header-anchor">#</a> 优化 resolve.alias</h3> <p><code>alias</code>给一些常用的路径起一个别名，特别当我们的项目目录结构比较深的时候，一个文件的路径可能是<code>./../../</code>的形式</p> <p>通过配置<code>alias</code>以减少查找过程</p> <div class="language-js extra-class"><pre class="language-js"><code>module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
    <span class="token operator">...</span>
    resolve<span class="token operator">:</span><span class="token punctuation">{</span>
        alias<span class="token operator">:</span><span class="token punctuation">{</span>
            <span class="token string">&quot;@&quot;</span><span class="token operator">:</span>path<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span><span class="token string">'./src'</span><span class="token punctuation">)</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre></div><h3 id="使用-dllplugin-插件"><a href="#使用-dllplugin-插件" class="header-anchor">#</a> 使用 DLLPlugin 插件</h3> <p><code>DLL</code>全称是 动态链接库，是为软件在winodw种实现共享函数库的一种实现方式，而Webpack也内置了DLL的功能，为的就是可以共享，不经常改变的代码，抽成一个共享的库。这个库在之后的编译过程中，会被引入到其他项目的代码中</p> <p>使用步骤分成两部分：</p> <ul><li>打包一个 DLL 库</li> <li>引入 DLL 库</li></ul> <h4 id="打包一个-dll-库"><a href="#打包一个-dll-库" class="header-anchor">#</a> 打包一个 DLL 库</h4> <p><code>webpack</code>内置了一个<code>DllPlugin</code>可以帮助我们打包一个DLL的库文件</p> <div class="language-js extra-class"><pre class="language-js"><code>module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
    <span class="token operator">...</span>
    plugins<span class="token operator">:</span><span class="token punctuation">[</span>
        <span class="token keyword">new</span> <span class="token class-name">webpack<span class="token punctuation">.</span>DllPlugin</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
            name<span class="token operator">:</span><span class="token string">'dll_[name]'</span><span class="token punctuation">,</span>
            path<span class="token operator">:</span>path<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span><span class="token string">&quot;./dll/[name].mainfest.json&quot;</span><span class="token punctuation">)</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>
    <span class="token punctuation">]</span>
<span class="token punctuation">}</span>
</code></pre></div><h4 id="引入-dll-库"><a href="#引入-dll-库" class="header-anchor">#</a> 引入 DLL 库</h4> <p>使用 <code>webpack</code> 自带的 <code>DllReferencePlugin</code> 插件对 <code>mainfest.json</code> 映射文件进行分析，获取要使用的<code>DLL</code>库</p> <p>然后再通过<code>AddAssetHtmlPlugin</code>插件，将我们打包的<code>DLL</code>库引入到<code>Html</code>模块中</p> <div class="language-js extra-class"><pre class="language-js"><code>module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
    <span class="token operator">...</span>
    <span class="token keyword">new</span> <span class="token class-name">webpack<span class="token punctuation">.</span>DllReferencePlugin</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
        context<span class="token operator">:</span>path<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span><span class="token string">&quot;./dll/dll_react.js&quot;</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
        mainfest<span class="token operator">:</span>path<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span><span class="token string">&quot;./dll/react.mainfest.json&quot;</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token keyword">new</span> <span class="token class-name">AddAssetHtmlPlugin</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
        outputPath<span class="token operator">:</span><span class="token string">&quot;./auto&quot;</span><span class="token punctuation">,</span>
        filepath<span class="token operator">:</span>path<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span><span class="token string">&quot;./dll/dll_react.js&quot;</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>
</code></pre></div><h3 id="使用-cache-loader"><a href="#使用-cache-loader" class="header-anchor">#</a> 使用 cache-loader</h3> <p>在一些性能开销较大的 <code>loader</code>之前添加 <code>cache-loader</code>，以将结果缓存到磁盘里，显著提升二次构建速度</p> <p>保存和读取这些缓存文件会有一些时间开销，所以请只对性能开销较大的 <code>loader</code> 使用此<code>loader</code></p> <div class="language-js extra-class"><pre class="language-js"><code>module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
    module<span class="token operator">:</span> <span class="token punctuation">{</span>
        rules<span class="token operator">:</span> <span class="token punctuation">[</span>
            <span class="token punctuation">{</span>
                test<span class="token operator">:</span> <span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">\.ext$</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">,</span>
                use<span class="token operator">:</span> <span class="token punctuation">[</span><span class="token string">'cache-loader'</span><span class="token punctuation">,</span> <span class="token operator">...</span>loaders<span class="token punctuation">]</span><span class="token punctuation">,</span>
                include<span class="token operator">:</span> path<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span><span class="token string">'src'</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
            <span class="token punctuation">}</span><span class="token punctuation">,</span>
        <span class="token punctuation">]</span><span class="token punctuation">,</span>
    <span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre></div><h3 id="terser-启动多线程"><a href="#terser-启动多线程" class="header-anchor">#</a> terser 启动多线程</h3> <p>使用多进程并行运行来提高构建速度</p> <div class="language-js extra-class"><pre class="language-js"><code>module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
  optimization<span class="token operator">:</span> <span class="token punctuation">{</span>
    minimizer<span class="token operator">:</span> <span class="token punctuation">[</span>
      <span class="token keyword">new</span> <span class="token class-name">TerserPlugin</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
        parallel<span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
      <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token punctuation">]</span><span class="token punctuation">,</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre></div><h3 id="合理使用-sourcemap"><a href="#合理使用-sourcemap" class="header-anchor">#</a> 合理使用 sourceMap</h3> <p>打包生成  <code>sourceMap</code> 的时候，如果信息越详细，打包速度就会越慢。对应属性取值如下所示：</p> <p><img src="https://static.vue-js.com/11647af0-b01d-11eb-85f6-6fac77c0c9b3.png" alt=""></p> <h3 id="三、总结"><a href="#三、总结" class="header-anchor">#</a> 三、总结</h3> <p>可以看到，优化<code>webpack</code>构建的方式有很多，主要可以从优化搜索时间、缩小文件搜索范围、减少不必要的编译等方面入手</p> <h2 id="参考文献"><a href="#参考文献" class="header-anchor">#</a> 参考文献</h2> <ul><li>https://github.com/ly2011/blog/issues/44</li> <li>https://xie.infoq.cn/article/541418eb82a674741a0ad8865</li> <li>https://zhuanlan.zhihu.com/p/139498741</li> <li>https://vue3js.cn/interview</li></ul></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">更新时间:</span> <span class="time">12/14/2021, 10:12:35 AM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
      ←
      <a href="/fe/webpack/performance.html" class="prev">
        Webpack 性能优化
      </a></span> <span class="next"><a href="/fe/webpack/Rollup_Parcel_snowpack_Vite.html">
        面试官：与webpack类似的工具还有哪些？区别？
      </a>
      →
    </span></p></div> </main></div><div class="global-ui"><!----></div></div>
    <script src="/assets/js/app.bf44e39b.js" defer></script><script src="/assets/js/2.db7a59af.js" defer></script><script src="/assets/js/249.35bae652.js" defer></script>
  </body>
</html>
